csdnceshi66
必承其重 | 欲带皇冠
2018-11-11 15:52

Gdb 软阵列打印阵列

  • c++
  • c
  • gdb
#include <stdio.h>
#include <malloc.h>
typedef struct _soft_array
{
    int len;
    int array[];//int array[0];
}SoftArray;

int main()
{  
    int i = 0;
    SoftArray* sa = (SoftArray*)malloc(sizeof(SoftArray) + sizeof(int) * 10);

    sa->len = 10;

    for(i=0; i<sa->len; i++)
    {
        sa->array[i] = i + 1;
    }

    for(i=0; i<sa->len; i++)
    {
        printf("%d\n", sa->array[i]);   
    }

    free(sa);

    return 0;
}

I use gdb to print the array of sa->array,then something confuse me:

(gdb) p sa->array
$1 = 0x602014
(gdb) p *sa->array@10
$2 = {[0] = 1, [1] = 2, [2] = 3, [3] = 4, [4] = 5, [5] = 6, [6] = 7, [7] = 8, [8] = 9, [9] = 10}
(gdb) p sizeof(int)
$3 = 4
(gdb) p *(char *)0x602014@40
$4 = "\001\000\000\000\002\000\000\000\003\000\000\000\004\000\000\000\005\000\000\000\006\000\000\000\a\000\000\000\b\000\000\000\t\000\000\000\n\000\000"
(gdb)

the first method went well (I add set print array-indexes on in .gdbinit).

sizeof(int)==4,then I use p *(char *)0x602014@40,due to my computer is little-endian,so 1 display with 01 00 00 00.

When display 7,the output become a?

How does that happen or I miss something ?

转载于:https://stackoverflow.com/questions/53250451/gdb-print-array-of-soft-array

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